Update to throw exceptions instead of logging errors [np-core]

[ixje]

This is a TODO for a project (see side bar)

Remove the logzero package dependency from neo-python-core and update the logging calls with raising the appropriate exceptions.

• Do not use the generic Exception class but use the more specific exception classes like ValueError, TypeError etc (standard lib exceptions).
• Create custom exceptions if needed to give sufficient control to the end-user.

First update neo-python-core, then update neo-python to deal with the new exceptions.